| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Vinny Bertolino,Frank Silva |
| Engineering Operator Run Comment |
| icrf l-mode |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:13:490PM |
| Author: To Be Determined |
| MP077A ICRF L-Mode (reversed BT, Ip) SL: Takase PO: Hutchinson EO: Bertolino/Silva Plan: Start from 950406035 (0.8A, nel_04=1.4e20) 1. Take lower Ip data (0.6MA, 0.4MA) 2. Density scan @ 0.8MA 3. Higher Ip (> 1MA) data, if possible It was not a very good day for RF. The whole morning was lost due to power supply/hybrid problems. Plasma was reliable after problems were fixed. However, RF had problems with arc protection circuits shutting the RF off. We have managed to get each of them separately, but we could not get both of them operating simultaneously. So we were not able to obtain high power data that we wanted, but got some intermediate power points. Most shots were 0.6MA. We had one 0.4MA shot at the end of the run, but the density was unexpectedly high and RF tripped out. Shot 01 Fiz 02 Fiz 03 Test EF2L test 04 Dud hybrid problem 05 Test 06 Test 07 Dud 08 Fiz 09 Fiz 10 Fiz 11 Pla 0.8MA, nel=1.4 (bumpy) 12 Fiz 13 Pla nel=0.9, no D-port, E-port 0.3MW, detached during RF 14 Fiz 0.6MA 15 Pla 0.6MA, nel=0.9, no D-port, E-port 0.5MW, 31-33kJ 16 Pla 0.6MA, nel=0.9, D-port 1MW, no E-port, 31-44kJ 17 Pla disrupted @ 0.8sec, no D-port, Camac error on E-port 18 Pla D-port 1.4MW, no E-port, seeing lots of injections 19 Pla no D-port, E-port 0.9MW, larger outer gap 20 Pla D-port 1.3MW, no E-port 21 Pla D-port 0.45MW, no E-port 22 Pla D-port 0.4MW (short), E-port 0.4MW 23 Pla no D-port, E-port 0.9MW 24 Pla no D-port, E-port 1.05MW 25 Pla D-port 0.75MW, no E-port 26 Pla higher dens, disrupt @ 0.72sec 27 Pla back to nel=1.0, no D-port, E-port 1.3MW 28 Pla no D-port, E-port 1.4MW 29 Pla D-port 1.15MW, no E-port 30 Pla D-port 1.2MW, no E-port 31 Pla 0.4MA, nel=1.5, disrupted @ 0.93sec, no RF |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:800PM |
| Author: To Be Determined |
From: PHYSOP::HUTCH Date: 12-APR-1995 17:47:09 Description: physop summary 950412 Physop Summary 950412 ICRF L-mode Confinement. SOL characterization with positive B. SL:Takase PO:Hutch EO:Bertolino/Silva Overview _________ The morning was spent on power-supply woes. EF2L was giving twice its nominal responsivity for the first two shots. Various other problems were experienced during the attempt to diagnose it. Eventually it fixed itself probably because of the tests. We also found that shot 2 from yesterday showed the same symptoms, but none of the other shots thereafter did. The most likely candidate for the cause of this problem is that the sense of one of the two halves of the supply is intermittent. Once the ps were fixed, it took a few shots to tune away the fizzles. Shot 15 and after were good reliable current ramps, and most did not disrupt unless the RF gassed them to death (17, 26). RF was experiencing difficulties getting both transmitters on together. Separately, each gave 1.2MW or more. Most shots were at 0.6MA with no PS rail problems. Shot 31 was a 0.4MA shot which ran onto EF1 voltage rails and died. This shot illustrates a serious p_bolo inconsistency: twice the input power is radiated! Scorecard _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.029 2 0.000 0.045 3 0.000 0.003 4 0.000 0.013 5 0.000 0.003 6 0.000 0.003 7 0.000 0.014 8 0.000 0.047 9 0.000 0.050 10 0.000 0.050 11 1.014 0.877 12 0.000 0.024 13 1.600 0.828 14 0.000 0.047 15 1.594 0.642 16 1.592 0.644 17 0.809 0.639 18 1.585 0.639 19 1.586 0.642 20 1.579 0.644 21 1.571 0.639 22 1.563 0.642 23 1.566 0.639 24 1.559 0.639 25 1.540 0.636 26 0.727 0.660 27 1.547 0.639 28 1.546 0.642 29 1.542 0.639 30 1.553 0.639 31 0.928 0.484 Finished summary for 950412 Total of 31 shots. 31 shots. 19 plasmas. 7 fizzles. 5 duds. Fizzle = gt 17 lt 50kA. Detailed Log ____________ Start from 950406035. Delay segment1 gas puff to 1ms (2ms later). Fill at 2.0e-5 1 Fiz Late breakdown 10ms. Nflux is ugly Br. EF2L 1821 A versus 1664 A. OH2L=21522(21895). OH2U=22757(22370). Found that EF2s are in the Br controller prior to breakdown. Removed EF2s from the Br controller in segment 1. 2 Fiz No significant change. Examining the EF2 demands and hybrids, we see that EF2L has its A voltage equal to the M-out demand. This means that its responsivitiy is double what it should be, since the sum of A and B should equal the M-out. It clearly has changed since yesterday. There were some bus instrumentation changes on this supply (or bus). Long pause to play with PS. 3 PStest EF2L test under PLC control. Looks OK. Further tests inside the PS shows no obvious internal problems. Continuous test from the hybrid AFOLs. Feedback signals seem to be there. Full test. 4 PSdud Power supplies do ghastly bizzare things. Control signals at the ps do not agree with the M-out signals. Go and check contector to hybrid. One contector "not snug" 5 Hybrid test. Breakers open. Engineering reports this was a null test because the PS were switched off and this disables the digitization of the relevant signals. Try again with PS on but breakers open. 6 Hybrid test. breakers open. All signals at the PS input look similar to those out of hybrid. On shot 4 they were garbage. Found that 950411002 had this same EF2L problem. Shots after that reverted to the correct behaviour. We are therefore dealing with an itermittent. Close breakers and try a shot. 7 PSdud OH switches did not close. This was because of the previous test. 8 Fiz Breakdown at 5.5ms. Bounces at 22ms. Lower EF1s by 50A to 4750. 9 Fiz Very similar EF1s to 4700. OH1 voltage to 0 from ~ 80V at 20ms. 10 Fiz Breakdown slightly earlier, 5ms; bounce at 19 ms. RCUR offset in segment 1 to 0 from 1000. EF1U demand to 4680 A. 11 Pla Big gas oscillation. Seems the gain is too large. Lower nl04 gain to 4 from 8. Demand to 1e20. Raise EF2/4 gain to 2 from .5. 12 Fiz Died inside at 15ms. Oh1 V to -100 at .01s (from -75) lower the Bz ramp rate in the first 12 ms. 13 Pla Long ramp down. Big density event at .75s. Detachment. Lower current to 0.6MA. 14 Fiz Delay pulse gas to 4ms. Raise early RCUR deriv gain to 9. 15 Pla Clearin to 1.3cm, ZXU to .047m 16 Pla RXU moved out. nl04 to 1.1. 17 Pla Disrupt at .8s. Caused by radiation/detachment at RF start. Raise fill to 2.2. Tweak RXU some more. 18 Pla Survived the RF... just! Clearin to 1.5cm 19 Pla Still stable but 16oHz z-oscillation. 20 Pla Ip ramp getting faster. Near bounce. Raise fill to 2.5. BR offset to .0005 from 0. 21 Pla Lower ICRF no gas influx. Enable Argon 20 ms at 90V. 22 Pla Boring Ic_EF4 gain drop to 1 moved back to .35s. 23 Pla 0.9 MW RF. Ic_EF4 demand to 2.5kA 24 Pla Less oscillation on EF4. 1.05MW RF Quite good heating, DT=.6kV electrons and ions. Raise nl04 to 1.4. Feather in FSP gain rise and ZXL gain drop more slowly near .5s. 25 Pla Rf=.75 MW. Density a little low. Raise Pulse gas V to 20V to help feedback. 26 Pla Disrupts at 0.75s. The extra density plus the RF kills it. Put nl04 demand back to 1.1 but leave the V tweak in. 27 Pla OK. Reasonable heating. 1.3MW from E-port. 28 Pla 1.4MW E-port. 29 Pla 30 Pla 1.2 Mw D-port Ip to 0.4MA, OH1,2 voltages lowered .1 to.3s. zcur to -.007 zxl to 0. FSP gain shrunk to 4 from 8. 31 Pla Disrupts at 0.91s. Density rises uncontrollably, although NINJA was puffing (as it had been on some previous ones) perhaps lower current is doing it. It also looks like a shark-fin. EF1s on voltage rail, looks like a VDE. This shot also illustrates a big discrepancy between Prad-Bolo (>1.5MW for a long time) and the input power (~0.8MW). |
| Entered: Jul 7 2004 04:36:53:833PM |
| Author: To Be Determined |
| Physop Summary 950412 ICRF L-mode Confinement. SOL characterization with positive B. SL:Takase PO:Hutch EO:Bertolino/Silva Overview _________ The morning was spent on power-supply woes. EF2L was giving twice its nominal responsivity for the first two shots. Various other problems were experienced during the attempt to diagnose it. Eventually it fixed itself probably because of the tests. We also found that shot 2 from yesterday showed the same symptoms, but none of the other shots thereafter did. The most likely candidate for the cause of this problem is that the sense of one of the two halves of the supply is intermittent. Once the ps were fixed, it took a few shots to tune away the fizzles. Shot 15 and after were good reliable current ramps, and most did not disrupt unless the RF gassed them to death (17, 26). RF was experiencing difficulties getting both transmitters on together. Separately, each gave 1.2MW or more. Most shots were at 0.6MA with no PS rail problems. Shot 31 was a 0.4MA shot which ran onto EF1 voltage rails and died. This shot illustrates a serious p_bolo inconsistency: twice the input power is radiated! Scorecard _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.029 2 0.000 0.045 3 0.000 0.003 4 0.000 0.013 5 0.000 0.003 6 0.000 0.003 7 0.000 0.014 8 0.000 0.047 9 0.000 0.050 10 0.000 0.050 11 1.014 0.877 12 0.000 0.024 13 1.600 0.828 14 0.000 0.047 15 1.594 0.642 16 1.592 0.644 17 0.809 0.639 18 1.585 0.639 19 1.586 0.642 20 1.579 0.644 21 1.571 0.639 22 1.563 0.642 23 1.566 0.639 24 1.559 0.639 25 1.540 0.636 26 0.727 0.660 27 1.547 0.639 28 1.546 0.642 29 1.542 0.639 30 1.553 0.639 31 0.928 0.484 Finished summary for 950412 Total of 31 shots. 31 shots. 19 plasmas. 7 fizzles. 5 duds. Fizzle = gt 17 lt 50kA. Detailed Log ____________ Start from 950406035. Delay segment1 gas puff to 1ms (2ms later). Fill at 2.0e-5 1 Fiz Late breakdown 10ms. Nflux is ugly Br. EF2L 1821 A versus 1664 A. OH2L=21522(21895). OH2U=22757(22370). Found that EF2s are in the Br controller prior to breakdown. Removed EF2s from the Br controller in segment 1. 2 Fiz No significant change. Examining the EF2 demands and hybrids, we see that EF2L has its A voltage equal to the M-out demand. This means that its responsivitiy is double what it should be, since the sum of A and B should equal the M-out. It clearly has changed since yesterday. There were some bus instrumentation changes on this supply (or bus). Long pause to play with PS. 3 PStest EF2L test under PLC control. Looks OK. Further tests inside the PS shows no obvious internal problems. Continuous test from the hybrid AFOLs. Feedback signals seem to be there. Full test. 4 PSdud Power supplies do ghastly bizzare things. Control signals at the ps do not agree with the M-out signals. Go and check contector to hybrid. One contector "not snug" 5 Hybrid test. Breakers open. Engineering reports this was a null test because the PS were switched off and this disables the digitization of the relevant signals. Try again with PS on but breakers open. 6 Hybrid test. breakers open. All signals at the PS input look similar to those out of hybrid. On shot 4 they were garbage. Found that 950411002 had this same EF2L problem. Shots after that reverted to the correct behaviour. We are therefore dealing with an itermittent. Close breakers and try a shot. 7 PSdud OH switches did not close. This was because of the previous test. 8 Fiz Breakdown at 5.5ms. Bounces at 22ms. Lower EF1s by 50A to 4750. 9 Fiz Very similar EF1s to 4700. OH1 voltage to 0 from ~ 80V at 20ms. 10 Fiz Breakdown slightly earlier, 5ms; bounce at 19 ms. RCUR offset in segment 1 to 0 from 1000. EF1U demand to 4680 A. 11 Pla Big gas oscillation. Seems the gain is too large. Lower nl04 gain to 4 from 8. Demand to 1e20. Raise EF2/4 gain to 2 from .5. 12 Fiz Died inside at 15ms. Oh1 V to -100 at .01s (from -75) lower the Bz ramp rate in the first 12 ms. 13 Pla Long ramp down. Big density event at .75s. Detachment. Lower current to 0.6MA. 14 Fiz Delay pulse gas to 4ms. Raise early RCUR deriv gain to 9. 15 Pla Clearin to 1.3cm, ZXU to .047m 16 Pla RXU moved out. nl04 to 1.1. 17 Pla Disrupt at .8s. Caused by radiation/detachment at RF start. Raise fill to 2.2. Tweak RXU some more. 18 Pla Survived the RF... just! Clearin to 1.5cm 19 Pla Still stable but 16oHz z-oscillation. 20 Pla Ip ramp getting faster. Near bounce. Raise fill to 2.5. BR offset to .0005 from 0. 21 Pla Lower ICRF no gas influx. Enable Argon 20 ms at 90V. 22 Pla Boring Ic_EF4 gain drop to 1 moved back to .35s. 23 Pla 0.9 MW RF. Ic_EF4 demand to 2.5kA 24 Pla Less oscillation on EF4. 1.05MW RF Quite good heating, DT=.6kV electrons and ions. Raise nl04 to 1.4. Feather in FSP gain rise and ZXL gain drop more slowly near .5s. 25 Pla Rf=.75 MW. Density a little low. Raise Pulse gas V to 20V to help feedback. 26 Pla Disrupts at 0.75s. The extra density plus the RF kills it. Put nl04 demand back to 1.1 but leave the V tweak in. 27 Pla OK. Reasonable heating. 1.3MW from E-port. 28 Pla 1.4MW E-port. 29 Pla 30 Pla 1.2 Mw D-port Ip to 0.4MA, OH1,2 voltages lowered .1 to.3s. zcur to -.007 zxl to 0. FSP gain shrunk to 4 from 8. 31 Pla Disrupts at 0.91s. Density rises uncontrollably, although NINJA was puffing (as it had been on some previous ones) perhaps lower current is doing it. It also looks like a shark-fin. EF1s on voltage rail, looks like a VDE. This shot also illustrates a big discrepancy between Prad-Bolo (>1.5MW for a long time) and the input power (~0.8MW). |
| Session Leader Comments | |||
| Apr 12 1995 08:37:21:330AM | 950412001 | Yuichi Takase | MP077A ICRF L-Mode (reversed BT, Ip)
Plan: Start from 950406035 (800kA, nel_04=1.4e20) Take lower Ip data (600kA, 400kA) Density scan @ 800kA Higher Ip (> 1MA) data, if possible Shot 001: Fizzle |
| Apr 12 1995 09:17:16:950AM | 950412002 | Yuichi Takase | Shot 002:
Fizzle Power supply (EF2L) problem being looked at. |
| Apr 12 1995 10:18:12:060AM | 950412003 | Yuichi Takase | Shot 003:
EF2L test. |
| Apr 12 1995 11:29:11:350AM | 950412004 | Yuichi Takase | Shot 004:
Dud, hybrid problem. |
| Apr 12 1995 11:29:34:570AM | 950412005 | Yuichi Takase | Shot 005:
hybrid test |
| Apr 12 1995 11:29:53:230AM | 950412006 | Yuichi Takase | Shot 006:
PS dud |
| Apr 12 1995 11:31:55:990AM | 950412006 | Yuichi Takase | Shot 006:
hybrid test |
| Apr 12 1995 11:32:15:850AM | 950412007 | Yuichi Takase | Shot 007:
PS dud |
| Apr 12 1995 11:32:30:360AM | 950412008 | Yuichi Takase | Shot 008:
Fiz |
| Apr 12 1995 11:40:22:140AM | 950412009 | Yuichi Takase | Shot 009:
Fiz |
| Apr 12 1995 12:06:05:820PM | 950412010 | Yuichi Takase | Shot 010:
Fiz |
| Apr 12 1995 12:07:37:720PM | 950412011 | Yuichi Takase | Shot 011:
Plasma (disrupted @ 1sec) Bumpy plasma with nel_04=1.4 to 1.9e20. |
| Apr 12 1995 12:13:39:920PM | 950412012 | Yuichi Takase | Shot 012:
Fizzle |
| Apr 12 1995 12:38:58:750PM | 950412013 | Yuichi Takase | Shot 013:
Plasma no D-port, E-port 0.3MW, nel=0.9, detached during RF going to 0.6MA for next shot |
| Apr 12 1995 12:39:49:480PM | 950412014 | Yuichi Takase | Shot 014:
Fizzle |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:33:01:850AM | Plasma | Ok | |
| 2 | 08:47:10:030AM | Plasma | Ok | |
| 3 | 10:04:29:780AM | Test | Ok | |
| 4 | 10:39:05:970AM | Plasma | Bad | hybrid signals incorrect |
| 5 | 10:53:27:140AM | Test | Ok | data system only |
| 6 | 11:06:42:630AM | Test | Ok | data only |
| 7 | 11:17:11:320AM | Plasma | Bad | oh switch faults |
| 8 | 11:25:49:300AM | Plasma | Ok | |
| 9 | 11:37:01:770AM | Plasma | Ok | |
| 10 | 11:47:18:270AM | Plasma | Ok | |
| 11 | 11:57:46:430AM | Plasma | Ok | |
| 12 | 12:11:55:400PM | Plasma | Ok | no faults |
| 13 | 12:22:14:630PM | Plasma | Ok | no faults |
| 14 | 12:37:16:610PM | Plasma | Ok | no faults |
| 15 | 12:47:35:290PM | Plasma | Ok | no faults |
| 16 | 01:01:38:570PM | Plasma | Ok | no faults |
| 17 | 01:15:52:460PM | Plasma | Ok | no faults |
| 18 | 01:28:47:130PM | Plasma | Ok | no faults |
| 19 | 01:45:28:720PM | Plasma | Ok | no faults |
| 20 | 02:01:43:370PM | Plasma | Ok | no faults |
| 21 | 02:18:05:900PM | Plasma | Ok | no faults |
| 22 | 02:34:25:480PM | Plasma | Ok | no faults |
| 23 | 02:49:53:680PM | Plasma | Ok | no faults |
| 24 | 03:09:52:940PM | Plasma | Ok | nofaults |
| 25 | 03:26:50:320PM | Plasma | Ok | no faults |
| 26 | 03:45:23:940PM | Plasma | Ok | no faults |
| 27 | 03:57:20:260PM | Plasma | Ok | no faults |
| 28 | 04:10:21:690PM | Plasma | Ok | no faults |
| 29 | 04:26:49:670PM | Plasma | Ok | no faults |
| 30 | 04:39:35:950PM | Plasma | Ok | no faults |
| 31 | 04:53:51:730PM | Plasma | Ok | no faults |